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81 lines
2.9 KiB
C++
81 lines
2.9 KiB
C++
/* -*-C-*-
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********************************************************************************
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*
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* File: outlines.cpp (Formerly outlines.c)
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* Description: Combinatorial Splitter
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* Author: Mark Seaman, OCR Technology
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*
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* (c) Copyright 1989, Hewlett-Packard Company.
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** Licensed under the Apache License, Version 2.0 (the "License");
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** you may not use this file except in compliance with the License.
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** You may obtain a copy of the License at
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** http://www.apache.org/licenses/LICENSE-2.0
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** Unless required by applicable law or agreed to in writing, software
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** distributed under the License is distributed on an "AS IS" BASIS,
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** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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** See the License for the specific language governing permissions and
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** limitations under the License.
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*
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********************************************************************************
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* Revision 1.2 89/09/15 09:24:41 09:24:41 marks (Mark Seaman)
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* First released version of Combinatorial splitter code
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**/
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/*----------------------------------------------------------------------
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I n c l u d e s
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----------------------------------------------------------------------*/
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#include "outlines.h"
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#include "wordrec.h"
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namespace tesseract {
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/*----------------------------------------------------------------------
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F u n c t i o n s
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----------------------------------------------------------------------*/
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/**********************************************************************
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* near_point
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*
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* Find the point on a line segment that is closest to a point not on
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* the line segment. Return that point in near_pt. Returns whether
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* near_pt was newly created.
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**********************************************************************/
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bool Wordrec::near_point(EDGEPT *point,
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EDGEPT *line_pt_0, EDGEPT *line_pt_1,
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EDGEPT **near_pt) {
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TPOINT p;
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float slope;
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float intercept;
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float x0 = line_pt_0->pos.x;
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float x1 = line_pt_1->pos.x;
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float y0 = line_pt_0->pos.y;
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float y1 = line_pt_1->pos.y;
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if (x0 == x1) {
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/* Handle vertical line */
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p.x = static_cast<int16_t>(x0);
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p.y = point->pos.y;
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}
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else {
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/* Slope and intercept */
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slope = (y0 - y1) / (x0 - x1);
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intercept = y1 - x1 * slope;
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/* Find perpendicular */
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p.x = static_cast<int16_t>((point->pos.x + (point->pos.y - intercept) * slope) /
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(slope * slope + 1));
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p.y = static_cast<int16_t>(slope * p.x + intercept);
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}
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if (is_on_line (p, line_pt_0->pos, line_pt_1->pos) &&
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(!same_point (p, line_pt_0->pos)) && (!same_point (p, line_pt_1->pos))) {
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/* Intersection on line */
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*near_pt = make_edgept(p.x, p.y, line_pt_1, line_pt_0);
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return true;
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} else { /* Intersection not on line */
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*near_pt = closest(point, line_pt_0, line_pt_1);
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return false;
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}
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}
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} // namespace tesseract
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